Vmware, Inc.

Kalaiselvi Sengottuvel

Andrei Warkentin

Jeffrey W Sheldon

Sunil Kumar Kotian

James Eugene Chow

Radu Rugina

Srihari Venkatesan

Alexander Dean Gotsis

Jiajun Cao

Techniques for implementing IOMMU-based DMA tracking for enabling live migration of VMs that use passthrough physical devices are provided. In one set of embodiments, these techniques leverage an IOMMU feature known as dirty bit tracking which is available in most, if not all, modern IOMMU implementations. The use of this feature allows for the tracking of passthrough DMA in a manner that is device/vendor/driver agnostic, resulting in a solution that is universally applicable to all passthrough physical devices.

IOMMU-based direct memory access (DMA) tracking for enabling live migration of virtual machines (VMS) using passthrough physical devices

Disclosed are various embodiments for various approaches for implementing trust domains to provide boundaries between PCIe devices connected to the same PCIe switch. A first trust identifier can be assigned to a first virtual machine hosted by the computing device. The first trust identifier can also be assigned to a first PCIe device assigned to the first virtual machine. Later, it can be determined that a second PCIe device connected to the PCIe switch is assigned a second trust identifier assigned to a second virtual machine. An Address Control Services (ACS) direct translated bit for peer-to-peer memory requests in the PCIe switch can be disabled in response to a determination that the second PCIe device is associated with the second trust identifier assigned to the second virtual machine.

Trust domains for peripheral devices

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Fremont, CA, United States of America

Kalaiselvi Sengottuvel